Remembering to look for and ignore folks with that telltale indicator has made the fediverse so much more enjoyable.
You'd be hard pressed to find many on the fediverse that aren't some flavor of leftist.
But yes. A lot of instances defederated from the .ml ones for the same reasons ml were generally blocked and banned from similar sites in the past. Which ironically led to the start of Lemmy and the link aggregation portion of the fediverse in the first place.